Square Columns • Rectangular Columns • Round Columns
Use this Concrete Column Calculator to estimate concrete for square, rectangular and circular columns, piers and posts. Enter column dimensions, height and quantity to calculate cubic feet, cubic yards, approximate concrete bags and optional ready-mix material cost.
Estimate rectangular columns, circular columns, multiple identical columns or bags and ready-mix cost.
Enter column width, depth and height to estimate concrete volume.
Column capitals, corbels, pedestal bases, footings and enlarged sections should be calculated separately.
Estimate a circular column or pier using finished diameter and height.
Estimate several identical rectangular columns and total the concrete quantity.
Estimate concrete bags and ready-mix cost for a rectangular column project.
Verify actual manufacturer yield.
The Concrete Column Calculator converts column cross-sectional area and height into total concrete volume. For a rectangular column, multiply width by depth by height. For a round column, calculate circular area from diameter, then multiply by height.
If the project contains multiple identical columns, enter the quantity so the calculator can multiply the per-column volume across the entire project. If columns differ in size or height, calculate each group separately and add the totals.
Choose rectangular or round column geometry.
Enter width/depth or finished diameter.
Use actual poured column height.
Multiply identical columns automatically.
Check drawings, forms and site conditions before buying.
A square or rectangular column is a rectangular prism. Width and depth are often shown in inches, while height is shown in feet, so width and depth must be converted to feet before manual calculations.
Cubic yards = cubic feet ÷ 27.
A circular column is treated as a cylinder. Divide diameter by two to find the radius, calculate circular area and multiply by column height.
Where r is column radius in feet.
| Column Size | Height | Approx. ft³ | Approx. yd³ | Shape |
|---|---|---|---|---|
| 12 × 12 in | 8 ft | 8.00 | 0.30 | Square |
| 12 × 12 in | 10 ft | 10.00 | 0.37 | Square |
| 16 × 16 in | 10 ft | 17.78 | 0.66 | Square |
| 18 in diameter | 10 ft | 17.67 | 0.65 | Round |
| 24 in diameter | 10 ft | 31.42 | 1.16 | Round |
These are exact geometric examples before optional ordering allowance.
Estimate square and rectangular cast-in-place columns.
Calculate cylindrical columns, piers and posts by diameter.
Multiply one column volume across repeated identical units.
Convert total column volume into cubic yards for ordering.
The answer depends on the column's cross-sectional size, height and quantity. A taller column uses proportionally more concrete, while increasing width or diameter can increase volume much faster because cross-sectional area grows.
For example, increasing a square column from 12 × 12 inches to 18 × 18 inches does more than simply increase both sides by 50%; the cross-sectional area rises from 1 square foot to 2.25 square feet.
Square and rectangular columns use width × depth to determine cross-sectional area. Round columns use π × radius². Two columns with the same nominal width can therefore contain different concrete volumes.
A 24-inch square column has a 4-square-foot cross section, while a 24-inch diameter round column has a circular area of about 3.14 square feet. Over a tall column, that difference can materially affect concrete quantity.
Use actual poured height rather than floor-to-floor dimension when these differ. A column may stop at the underside of a beam or slab, or include a pedestal below the finished floor. Review the structural detail before entering height.
If the column changes cross section over its height, split it into separate segments. Calculate each constant-size section independently and add the volumes.
The basic column calculators assume a constant cross section. Capitals, drop panels, corbels and enlarged pedestals can add substantial concrete. Calculate those components separately rather than hiding them inside the column height.
For pedestal-style or foundation elements, the Concrete Pier Calculator or Concrete Footing Calculator may also be useful depending on geometry.
Small posts and short column repairs may be practical with bagged concrete. Large structural columns can require much more volume and are commonly coordinated with ready-mix placement.
The Bags & Cost calculator uses an editable bag yield because manufacturer yields vary. Always verify the actual package yield rather than assuming every 40, 60 or 80 lb product produces the same volume.
The optional ready-mix price field multiplies estimated cubic yards by the local price entered by the user. This represents concrete material only.
For pumped placement, use the Concrete Pump Capacity Calculator.
Structural columns commonly contain vertical reinforcing bars and ties or spirals. Reinforcement quantity should be estimated separately from concrete volume. Ordinary concrete takeoffs generally do not subtract the physical volume of reinforcing steel from the formed concrete geometry.
Use the Concrete Rebar Calculator or Concrete Rebar Length Calculator for reinforcement takeoff.
The exact volume assumes perfect forms and zero placement loss. Real construction can require slightly more material.
The calculator includes optional allowance percentages for comparison. Final ordering should reflect actual field conditions and supplier practices.
For round columns, radius equals one-half of diameter.
Convert width, depth or diameter from inches to feet before multiplying manually.
Review actual structural geometry.
Multiply the single-column volume by project quantity.
Calculate enlarged sections separately.
Group columns by actual dimensions.
This tool estimates material quantity only.
Tall or heavily reinforced columns can be difficult to place because concrete must move through reinforcement and forms without segregation or large voids. Placement method, lift height, vibration and concrete workability should follow the project specification and construction plan.
The calculator does not determine slump, mix design, consolidation procedure or permissible placement rate. Coordinate those decisions with the project team and concrete supplier.
After placement and finishing, concrete columns require curing according to the project specification. Forms may help reduce moisture loss while they remain in place, but exposed surfaces can still require curing measures.
For scheduling, use the Concrete Cure Time Calculator. Do not use calendar age alone as proof of structural strength.
For technical concrete information, standards and construction education, useful industry resources include the American Concrete Institute and the National Ready Mixed Concrete Association.
Structural columns are safety-critical elements. Follow approved drawings, project specifications, local requirements and qualified professional guidance.
Column concrete is determined by cross-sectional area multiplied by poured height.
A 16 × 16 inch square column that is 10 feet high has a cross-sectional area of about 1.78 square feet.
With a 10% comparison allowance, the estimate becomes approximately 0.72 cubic yard.
Common questions about square columns, round columns, cubic yards, multiple columns, bags and ready-mix.